Device and method for repairing pipe

ABSTRACT

A liner tube is provided for repairing either a single pipe line or a main pipe line having a lateral pipe line connected thereto. The liner tube assembly includes a liner tube impregnated with a liquid material capable of curing and hardening. The liner tube includes a gasket or band positioned about the juncture of the pipe lines. The gasket or bands form a tight seal between the liner tube and the pipe line.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation application of U.S. Ser. No.13/161,581 filed Jun. 16, 2011, which is a Continuation application ofU.S. Ser. No. 11/845,134 filed Aug. 27, 2007, now U.S. Pat. No.7,975,726 issued Jul. 12, 2011, all of which are incorporated byreference in their entirety.

BACKGROUND OF THE INVENTION

The present invention relates to a device and method for repairing pipe,such as underground sewer pipe and the like.

Prior methods for repairing damaged pipe lines include moving a linertube impregnated with a liquid material capable of curing and hardeningto the position within the pipe where the damaged portion is located.The liner tube is urged in an outward radial direction into contact withthe pipe line being repaired and the liquid material impregnating theliner tube is permitted to cure and harden. The liner tube forms aninterior liner in the pipe for the pipe line being repaired.

On some occasions lateral pipe lines are connected to main pipe lines.Often damage occurs at the junction between the lateral pipe line andthe main pipe line. T-shaped or Y-shaped liner tubes have been utilizedto fit within the junction between the lateral pipe line and the mainpipe line. Liner tubes form a T-shaped or Y-shaped liner after hardeningto the interior of the junction between the lateral pipe line and themain pipe line.

Ground water outside the lateral pipe line and the main pipe lineinfiltrates through the damaged portion of the pipe line and migratesbetween the liner tube and the pipe line to a point where it can enterthe pipe line. In order to prevent this infiltration of ground water,attempts have been made to adhere the liner tube to the interior surfaceof the pipe line being repaired, whether it is a single straight pipeline or a T-shaped or Y-shaped pipe line.

However, considerable difficulty has been encountered in attempting toobtain an adhesive bond between the liner tube and the interior of thepipe being repaired. The interior of the pipe being repaired is oftengreasy or oily even after high pressure water jetting is performed.Attempts have been made to wash the interior of the pipe line with somesuccess, but washing the interior of the pipe line is often only partialand not reliable. Furthermore, in some types of pipes, such aspolyethylene pipes, an adhesive bond cannot be maintained between theresin impregnated liner tube and the polyethylene pipe even if the pipeis free from grease and oils.

Even in those instances where the interior of the pipe line is suitablefor accepting a liner, shrinkage of the liner can occur, which creates agap that allows ground water to flow around the liner and eventuallyinfiltrate the pipe line. For example, thermoset resins are used incured-in-place pipe applications to form the liner to the interior ofthe pipe line. These thermoset resins tend to shrink during the curingprocess, thus creating a gap between the liner and the pipe. Even theslightest shrinkage in the liner can be problematic.

U.S. Pat. No. 6,994,118 addresses some of these problems in the art. Thepresent invention constitute improvements and additions to the earlierdisclosure.

A primary object of the present invention is the provision of animproved device and method for repairing pipe by using hydrophilic sealsor other impermeable compressible materials.

A further object of the present invention is the provision of a deviceand method for preventing ground water from infiltrating a pipe linenear the juncture between a main pipe line and a lateral pipe line.

A further object of the present invention is the provision of a deviceand method for repairing a section of a pipe and preventing entry ofground water from a damaged portion of the pipe being repaired.

A further object of the present invention is the provision of a deviceand method for repairing the juncture between a main pipe line and alateral pipe line which uses a hydrophilic band or similar article ofimpermeable compressible material positioned between the main pipe lineand the liner around the opening that connects the main pipe line to thelateral pipe line.

A further object of the present invention is the provision of a deviceand method for repairing the juncture between a main pipe line and alateral pipe line which uses a hydrophilic gasket or gasket of similarimpermeable compressible material that seals against entry of groundwater at the juncture between the pipe lines.

A further object of the present invention is the provision of a deviceand method for repairing pipe using hydrophilic seals and the like whichis economical to manufacture, durable in use, and reliable in operation.

BRIEF SUMMARY OF THE INVENTION

According to one feature of the present invention, an apparatus isprovided for repairing the juncture between a main pipe line and alateral pipe line. The apparatus includes a main liner member and alateral liner tube made of resin absorbent material. A hydrophilicgasket or gasket of similar impermeable compressible material surroundsa portion of both the main liner member and the lateral liner tube andis positioned between the host pipes and the liner assembly inoperation. The hydrophilic gasket is capable of swelling in response tobeing exposed to a liquid, such as water, and forms a seal between theliner assembly and the host pipes at the juncture between the hostpipes. The apparatus can be used in applications where the lateral lineris inverted into the lateral pipe line or in so-called “pull-in-place”applications. In a pull-in-place application, both the main liner andlateral liner are moved through the main pipe line to a position wherethe lateral liner ultimately extends inside the lateral pipe line andthe main liner is positioned in the main pipe line near the accessopening to the lateral pipe line.

According to another feature of the present invention, a hydrophilicband or band made of a similar impermeable compressible material ispositioned on the main liner portion of a main/lateral liner. The bandsurrounds the opening between the main and lateral liners and isdisposed between the main pipe line and the liner around the peripheryof the opening between the main and lateral pipes to effectively sealagainst entry of ground water at the pipe junction. Again, thisapparatus is suitable for use in both inversion-style applications andpull-in-place applications.

According to yet another feature of the present invention, an apparatusand method for inverting a liner in a cured-in-place application isprovided. The liner includes two hydrophilic bands connected to theinterior lining surface of the liner that are spaced apart from oneanother a sufficient distance so as to create a seal between the hostpipe and the liner on opposite sides of the damaged portion of the pipe.When the liner is inverted, the hydrophilic bands are positioned on theoutside of the liner between the host pipe and the liner. Exposing thehydrophilic bands to water or other liquid causes them to swell, therebycreating the desired seal.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a repair assembly for repairing alateral pipe line and a main pipe line.

FIG. 2 is a sectional view of a main pipe line and a lateral pipe lineshowing one embodiment of the present invention.

FIG. 3 is a view similar to FIG. 2, but showing the liner in itsinflated position.

FIG. 4 is a perspective view of an alternative embodiment of a repairassembly for repairing a lateral pipe line and a main pipe line.

FIG. 5 is a sectional view of a main pipe line and a lateral pipe lineshowing the device in FIG. 4.

FIG. 6 is a view similar to FIG. 5, but showing the liner in itsinflated position.

FIG. 7 is a sectional view of a pipe line, showing another embodiment ofthe present invention.

FIG. 8 is a sectional view similar to FIG. 7, showing the liner in apartially inverted position.

FIG. 9 is a sectional view similar to FIG. 8, showing the liner in afully inverted position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1-3, a repair assembly is generally designated by thenumeral 10. Repair assembly 10 includes a launcher device 12 havingmounted thereto a T-shaped or Y-shaped liner assembly 14. Repairassembly 10 also houses a T-shaped or Y-shaped bladder assembly 16. Inthe particular configuration shown in FIGS. 1-3, the liner assembly 14and bladder assembly 16 are T-shaped, but they can also be Y-shaped toaccommodate a lateral pipe line that intersects with a main pipe line atan oblique angle.

Launcher device 12 includes side walls 18, an end cap 20 and an end wall22, all of which form a launcher device cavity 48. End cap 20 includes aline inlet 24 through which a line 26 extends. Line 26 is attached to aclosed bladder tube end 28. Also extending through end cap 20 is an airinlet 30 which is connected to an air hose 32. T-shaped or Y-shapedbladder tube assembly 16 includes a main bladder tube 34 and a lateralbladder tube 36. Similarly, the T-shaped or Y-shaped liner assembly 14includes a main liner tube 38 and a lateral liner tube 40. The bladderassembly 16 is fitted on the interior of the liner assembly 14.

As can be seen in FIG. 1, the main liner tube 38 is comprised of what isinitially a flat sheet of material which is wrapped around the outsideof the main bladder tube 34 and the launcher device 12. The main linertube 38 includes overlapping edges 42, 44. The launcher device 12includes a launcher device opening 46, and the lateral liner tube 40 iscontained within the launcher device cavity 48 as shown in FIG. 2.Similarly, the lateral bladder tube 36 is contained within the cavity 14and surrounds the lateral liner tube 40. Both the main liner tube 38 andthe lateral liner tube 40 are comprised of a felt layer, which is thelining surface that contacts the interior surface of the host pipe, anda polymer coating is on the opposite surface.

FIGS. 2 and 3 show the repair assembly 10 within a main pipe line 50which is connected to a lateral pipe line 52. The damaged portion 54 isshown needing repair. Ground water from outside the lateral pipe line 52and the main pipe line 50 will seep through the damaged portion 54 andenter the interior of the main pipe line 50 and the lateral pipe line52.

In order to prevent this seepage of ground water, a gasket 56 ispositioned about a portion of the liner assembly 14. The gasket 56includes a tubular portion 60 that extends at least partially within thelateral liner tube 40 and a flange portion 58 that extends outwardlyabout the periphery of one end of the tubular portion 60. The flangeportion 58 of the gasket 56 is preferably attached to the main linertube 38 around the juncture between the main liner tube 38 and thelateral liner tube 40 so as to maintain the gasket 56 in proper positionas the repair assembly 10 is positioned for operation. The gasket 56 ispreferably made of a hydrophilic material capable of swelling inresponse to being exposed to water or other liquid. However, othermaterials for the gasket 56 found suitable include neoprene rubber,other similar gasket materials such as urethane or silicone rubber, andlike impermeable compressible materials.

FIG. 2 shows the repair assembly 10 moved within the main pipe line 50adjacent the lateral pipe line 52. The launcher device opening 46 isregistered with a junction between a lateral pipe line 52 and the mainpipe line 50. This alignment is done with a TV camera (not shown). Thelateral bladder tube 36 and the lateral liner tube 40 are containedwithin the launcher device cavity 48. It should be noted that thelateral liner tube 40 and tubular portion 60 of the gasket 56 extendwithin the lateral bladder tube 56 in FIG. 2; whereas, the main linertube 38 and the flange portion 60 of the gasket 56 remain outside themain bladder tube 34 on the exterior of the launcher device 12.

Air pressure is introduced in the cavity 48 through air hose 32, urgingthe liner tube assembly 14 into contact with the interior walls of themain pipe line 50 and the lateral pipe line 52. Continued air pressurecauses the lateral bladder tube 36 and the lateral liner tube 40 toinvert outwardly through the launcher device opening into the lateralpipe line 52 from the position shown in FIG. 2 to the position shown inFIG. 3. While air is the preferred pressurized material, other gasses orfluids may be used. It should be noted that this inversion processcauses the lateral liner tube 40 to be placed on the outside of thebladder tube 36 once the inversion is complete, as shown in FIG. 3. Inthis position, the gasket 56 is positioned between the main liner tubeassembly 14 and the interior walls of the main pipe line 50 and betweenthe lateral liner tube assembly 16 and the interior walls of the lateralpipe line 52. Pressure within cavity 48 is maintained until the liquidhardenable material, preferably a resin activated with a catalyst, curesand hardens. This results in the liner assembly 14 assuming a rigidconfiguration, forming a lining to the lateral pipe line 52 and the mainpipe line 50.

The gasket 56 is preferably made of a material which is hydrophilic andwhich is capable of expanding in response to encountering ground wateror other liquid. A manufacturer of such hydrophilic material is DeNeefConstruction Chemical Co., 18314 Mathes Road, Waller, Tex. 77484, underthe trademark SWELLSEAL™.

The ground water, as designated by the arrows 90 in FIG. 3, can seeptowards the hydrophilic gasket 56. However, upon encountering thehydrophilic gasket, the water causes the gasket to expand in both aradial inward direction and a radial outward direction. This causes thegasket 56 to form a water tight seal between the T-shaped or Y-shapedliner assembly 14 and the interior walls of the main pipe line 50 andthe lateral pipe line 52.

While the preferred embodiment of the invention is intended for use withan inversion-type application wherein the lateral bladder tube 36 andthe lateral liner tube 40 invert outwardly into the lateral pipe line52, those skilled in the art will appreciate that the gasket 56 can alsobe used in pull-in-place applications. In a pull-in-place application,the gasket can be threaded down the lateral liner tube 40 to thejuncture between the main liner tube 38 and the lateral liner tube 40.In such a pull-in-place application, it is less important that thegasket 56 be attached to the liner assembly 14, as the gasket 56 willtend to stay in proper position as the lateral bladder tube 36 andlateral liner tube 40 are moved through the main pipe line 50 andultimately into the lateral pipe line 52 while at the same time the mainbladder tube 34 and main liner tube 38 are moved along the main pipeline 50 to a position adjacent the opening to the lateral pipe line 52.

Although the precise dimensions of the gasket are not necessarilycritical to the present invention, a tubular portion having a length ofapproximately 6 inches and a flange portion 60 having a diameter ofapproximately 12 inches has been found suitable for most sewer pipeapplications.

FIGS. 4, 5 and 6 illustrate an alternative embodiment of the presentinvention wherein the gasket 56 is replaced with a ring-shaped band 62of hydrophilic material or like impermeable compressible material. Theband 56 is positioned on the main liner tube 38 and extends around thejuncture between the main liner tube 38 and the lateral liner tube 40.The band 62 is again preferably made of a hydrophilic material andswells in response to being exposed to water or other liquid. Inspecific, the band 62 expands outwardly and inwardly in a radialdirection to effectively seal the area between the liner assembly andthe juncture between the main pipe line 50 and lateral pipe line 52.

In applications where the lateral liner tube 40 is inverted into thelateral pipe line 52, it is preferred that the band 62 is attached tothe main liner tube 38 to secure the band in place. The band can beattached by means of stitching, stapling, or by use of an adhesive orsimilar attachment means. The band 62 may be made from a hydrophilicmaterial such as the one provided by DeNeef Construction Chemical Co.(described previously). A hydrophilic paste can also be used to form thering or band 62 on the main liner tube 38. One such hydrophilic paste isdistributed by OCM, Inc. in Vernon Hills, Ill. under the trademark ADEKAULTRA SEAL, part number P-201. This product is a single componenthydrophilic paste used in water stop repairs. The band 62 may also bemade from a paste that is no hydrophilic yet forms an impermeablecompressible gasket when cured. One such impermeable compressible pasteis distributed by Manus Products, Inc. in Waconia, Minn.

FIGS. 7, 8 and 9 illustrate another version of the present invention.Although U.S. Pat. No. 6,994,118 discloses the use of hydrophilic sealspositioned between the host pipe and the liner tube on opposite sides ofthe damaged portion of a pipe line, simply moving the liner tube andbladder into position along the pipe line has well-known disadvantagesnot experienced by inversion techniques. The present invention alsoincludes an embodiment wherein hydrophilic seals or bands can bepositioned on opposite sides of a damaged portion of a pipe line throughan inversion-style lining technique. FIG. 7 illustrates a singular pipe70 having a damaged portion 72. A launcher device 92 houses a liner tube74 and a bladder tube 84 and is positioned in the pipe 70. About theinterior lining surface of the liner tube 74 is a first hydrophilic bandor seal 76 and a second hydrophilic band or seal 78 spaced apart so asto be located on opposite sides of the damaged portion 72 of the pipe 70when the bladder tube 84 and liner tube 74 are inverted. The first andsecond hydrophilic bands or seals 76, 78 are attached to the interiorlining surface of the liner tube 74 by stitching, stapling, by use of anadhesive or other suitable attachment means.

FIG. 8 shows the liner tube 74 and the bladder tube 84 is a partiallyinverted position.

FIG. 9 shows the liner tube 74 and the bladder tube 84 fully invertedwherein the liner tube 74 is positioned at the damaged portion 72 andthe first and second hydrophilic bands or seals 76, 78 are located onopposite sides of the damaged portion 72 of the pipe 70. In theseinstances where the lining begins a significant distance away from thelauncher device, the bladder tube 84 acts as a positioning tube with theliner tube 74 positioned accordingly inside the bladder tube 84, so thatthe liner tube 74 does not invert until it reaches the damaged portion72 of the pipe 70.

The liner tube 74 comprises a layer of felt-like material which isimpregnated with a liquid material capable of curing and hardening andmay have a polymer outside layer or coating. The bladder tube 84 isinside the liner tube 74 after inverting and includes a closed end 86and a line 88 extending outwardly there from. Air or fluid is introducedinto the interior of bladder tube 84 to urge the bladder tube 84radially outwardly so as to urge the liner tube 74 into contact with thetube 70 being repaired.

The first and second hydrophilic bands or seals 76, 78, when encounteredby ground water seeping through the damaged portion 72 will expand andform a water tight seal on opposite sides of the damaged portion 72.This prevents water from entering the interior of the pipe line 70.

Those skilled in the art having the benefit of this disclosure willappreciate that in some applications a single band or seal can be usedto prevent ground water from entering the interior of the pipe line. Forexample, in lining a lateral pipe towards a main pipe, positioning ahydrophilic band at the downstream end of the liner prevents groundwater from running down between the liner and pipe and emptying backinto the pipe line.

The invention has been shown and described above with reference to thepreferred embodiments, and it is understood that many modifications,substitutions, and additions may be made which are within the intendedspirit and scope of the invention. The invention is only to be limitedby the claims appended hereto.

What is claimed is:
 1. A method of repairing a main pipe and a lateralpipe connected thereto and in communication therewith to form a pipejoint, comprising: taking a bladder assembly comprising a main bladdertube and a lateral bladder tube; taking a liner assembly comprising amain liner member and a lateral liner tube in communication with oneanother at a liner juncture; impregnating the liner assembly with amaterial capable of curing and hardening; applying a hydrophilic pasteto the liner assembly about at least a portion of the liner juncture;expanding the bladder assembly to position the lateral liner tubeagainst the lateral pipe and the main liner member against the main pipewith the hydrophilic paste at least partially disposed between the mainliner member and the main pipe; and allowing the material capable ofcuring and hardening to cure and harden.
 2. The method of claim 1wherein the hydrophilic paste is applied on the main liner member. 3.The method of claim 2 wherein the hydrophilic paste is spaced apart fromthe liner juncture on the main liner member.
 4. The method of claim 1wherein the hydrophilic paste fully encircles the liner juncture.
 5. Themethod of claim 4 wherein the hydrophilic paste is applied to form aring or band around the liner juncture.
 6. The method of claim 1 whereinthe paste is applied at least partially on both the main liner memberand the lateral liner tube.
 7. The method of claim 1 wherein the mainliner member forms a tube.
 8. The method of claim 1 further comprisingremoving the bladder assembly from the main pipe and the lateral pipe.9. The method of claim 1 wherein the lateral line tube is inverted intothe lateral pipe.
 10. The method of claim 1 wherein the liner assemblyis impregnated with a material capable of curing and hardening beforethe hydrophilic paste is applied to the liner assembly.
 11. A method ofrepairing a main pipe and a lateral pipe connected thereto and incommunication therewith to form a pipe joint, comprising: taking abladder assembly comprising a main bladder tube and a lateral bladdertube; taking a liner assembly comprising a main liner member and alateral liner tube in communication with one another at a linerjuncture; impregnating the liner assembly with a material capable ofcuring and hardening; applying a paste of compressible and impermeablematerial to the liner assembly about at least a portion of the linerjuncture; expanding the bladder assembly to position the lateral linertube against the lateral pipe and the main liner member against the mainpipe with the paste at least partially disposed between the main linermember and the main pipe; and allowing the material capable of curingand hardening to cure and harden.
 12. The method of claim 11 wherein thepaste is applied on the main liner member.
 13. The method of claim 12wherein the paste is spaced from the liner juncture on the main linermember.
 14. The method of claim 11 wherein the paste fully encircles theliner juncture.
 15. The method of claim 14 wherein the paste is appliedto form a ring or band around the liner juncture.
 16. The method ofclaim 11 wherein the paste is applied at least partially on both themain liner member and the lateral liner tube.
 17. The method of claim 11wherein the main liner member forms a tube.
 18. The method of claim 11further comprising removing the bladder assembly from the main pipe andthe lateral pipe.
 19. The method of claim 11 wherein the lateral linetube is inverted into the lateral pipe.
 20. The method of claim 11wherein the liner assembly is impregnated with a material capable ofcuring and hardening before the paste is applied to the liner assembly.21. An apparatus for repairing a main pipe and a lateral pipe connectedthereto and in communication therewith to form a pipe joint, comprising:a bladder assembly comprising a main bladder tube and a lateral bladdertube extending from the main bladder tube; a liner assembly comprising amain liner member at least partially surrounding the main bladder tubeand a lateral liner tube extending from the main liner member and incommunication with the main liner member at a liner juncture; thelateral liner tube and lateral bladder tube extendable to a positionwithin the lateral pipe line with the lateral liner tube between thelateral pipe line and the lateral bladder tube; and a hydrophilic pastedisposed on the liner assembly and at least partially around the linerjuncture when the lateral liner tube is extended into the lateral pipeline.
 22. The apparatus of claim 21 wherein the hydrophilic paste isdisposed on the main liner member.
 23. The apparatus of claim 22 whereinthe hydrophilic paste is spaced apart from the liner juncture.
 24. Theapparatus of claim 21 wherein the hydrophilic paste fully encircles theliner juncture.
 25. The apparatus of claim 21 wherein the hydrophilicpaste is disposed at least partially on both the main liner member andthe lateral liner tube.
 26. The apparatus of claim 21 wherein the mainliner member forms a tube.
 27. An apparatus for repairing a main pipeand a lateral pipe connected thereto and in communication therewith toform a pipe joint, comprising: a bladder assembly comprising a mainbladder tube and a lateral bladder tube extending from the main bladdertube; a liner assembly comprising a main liner member at least partiallysurrounding the main bladder tube and a lateral liner tube extendingfrom the main liner member and in communication with the main linermember at a liner juncture; the lateral liner tube and lateral bladdertube extendable to a position within the lateral pipe line with thelateral liner tube between the lateral pipe line and the lateral bladdertube; and a paste of compressible and impermeable material disposed onthe liner assembly and at least partially around the liner juncture whenthe lateral liner tube is extended into the lateral pipe line.
 28. Theapparatus of claim 27 wherein the paste is disposed on the main linermember.
 29. The apparatus of claim 27 wherein the paste fully encirclesthe liner juncture.
 30. The apparatus of claim 27 wherein the main linermember forms a tube.